Abstract: The invention concerns a method for making composite plates which consists in driving along a specific direction a bundle of parallel yarns; associating with this yarn a yarn layer transversely oriented relative to said specific direction, the bundle of yarn and/or yarn layer comprising at least an organic material and at least a reinforcing material, and the assembly comprising at least 10 wt. % of organic material; heating the assembly moving in the specific direction, and fixing it, by heating and/or pressure, then by cooling, so as to form a composite strip; collecting the strips in the form of one or several composite plates. The invention also concerns a device for implementing the method and the resulting product.